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Sensor is reading a rich condition 1v can you introduce a vacuum leak to see if it will drop down to .2v?
Reason being it may not be the sensor at fault could be engine running rich.
Fuel trims are normal LT+ ST within plus/minus 10?

In addition circuit signal/heater circuit could be at fault.
Pigtail connection tight?
May disconnect/reconnect to see if have any effect.

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I believe both upstream oxygen sensors are the same, I'm saying this just in case you replaced the wrong one and you could install the sensor you removed into the other location if this is the case. The firewall side of the engine is Bank 1 and the radiator side is Bank 2.

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